1009364857 has 4 divisors (see below), whose sum is σ = 1009434240. Its totient is φ = 1009295476.

The previous prime is 1009364833. The next prime is 1009364891. The reversal of 1009364857 is 7584639001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7584639001 = 10079 ⋅752519.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1009364857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009364827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3553 + ... + 45070.

It is an arithmetic number, because the mean of its divisors is an integer number (252358560).

Almost surely, 2^1009364857 is an apocalyptic number.

It is an amenable number.

1009364857 is a deficient number, since it is larger than the sum of its proper divisors (69383).

1009364857 is an equidigital number, since it uses as much as digits as its factorization.

1009364857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69382.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1009364857 is about 31770.5029390471. The cubic root of 1009364857 is about 1003.1119248782. Note that the first 3 decimals are identical.

The spelling of 1009364857 in words is "one billion, nine million, three hundred sixty-four thousand, eight hundred fifty-seven".